package ioexercise;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyDemo {
    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("img10.jpg");
        FileOutputStream fos = new FileOutputStream("img10_cp5.jpg");
        long start = System.currentTimeMillis();
        byte[] data = new byte[1024*10];
        int len;
        while ((len=fis.read(data))!=-1){
            fos.write(data,0,len);
        }
        long end = System.currentTimeMillis();
        System.out.println("复制完毕！耗时:"+(end-start)+"ms");
        fis.close();
        fos.close();









//        FileInputStream fis = new FileInputStream("img10.jpg");
//        FileOutputStream fos = new FileOutputStream("img10_cp5.jpg");
//        long start = System.currentTimeMillis();
//        byte[] data = new byte[1024*10];
//        int len;
//        while ((len=fis.read(data))!=-1){
//            fos.write(data,0,len);
//        }
//        long end = System.currentTimeMillis();
//        System.out.println("复制完毕！耗时:"+(end-start)+"ms");
//        fis.close();
//        fos.close();
    }
}
